[usage] calcium dihydrogen phosphate (feed grade) is widely used for aquatic animals as phosphorus and calcium additive, aquatic animals with rectal absorption of phosphorus, calcium and other nutrients.Therefore, for the production of aquatic feed enough water soluble calcium dihydrogen phosphate requirements.Test showed that aquatic animals utilization of phosphorus in bona, calcium dihydrogen phosphate as the best, the phosphorus utilization rate of 98%, far better than calcium hydrogen phosphate 20-60%.The product performance, cost and other comprehensive income much higher compared to the same elements with other phosphorus sources.